Thread forming tap with a non-circular cross-section and radially extending cutting edges

a technology of cutting edge and cross-section, which is applied in the direction of manufacturing tools, wood boring tools, transportation and packaging, etc., can solve the problem of disadvantageous tap types

Inactive Publication Date: 2006-12-19
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]Advantageously, the diameter of the thread of the thread forming portion increases from the level of the cut ridges of the relief portion. Hereby, thread forming is made possible.

Problems solved by technology

That kind of tap is however disadvantageous, as it can barely be used for other openings than circular cylindrical holes.

Method used

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  • Thread forming tap with a non-circular cross-section and radially extending cutting edges
  • Thread forming tap with a non-circular cross-section and radially extending cutting edges
  • Thread forming tap with a non-circular cross-section and radially extending cutting edges

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Embodiment Construction

[0019]FIG. 1 shows a thread forming tap 2, comprising an elongated body 4 having an axis A—A. The elongated body 4 has at a first end 6, a connector portion 8 and at a second end 10 a thread forming portion 12, and a thread relief portion 14. The tap 2 is preferably made of a high speed steel or a solid carbide material. The connector portion 8 is adapted to be connected to a tool holder of a drilling or milling machine.

[0020]The thread forming portion has a thread forming thread comprising a ridge 18 separated by a helical groove 20. The diameter of the thread 18 increases from the relief portion 14 towards the second end S and after a few pitches, the diameter is constant (however not circular, see below).

[0021]The thread relief portion 14 is provided with a helical thread having a cut (truncated) ridge 22 having a substantially circular cylindrical form separated by a helical groove 24. The cut ridge 22 has a smaller diameter than the largest diameter of the thread forming thread...

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Abstract

A thread-forming tap includes an elongated body having, at first end, a connector portion, and having at a second end, a thread-forming portion. The thread-forming portion includes at least one thread-forming helical thread exhibiting a non-circular cross-section having at least three lobes for plastically deforming an interior wall of a workpiece while forming an internal thread therein. A thread relief portion formed by a helical truncated thread, is disposed between the thread-forming thread and a terminal end of the body. Disposed at the end of the elongated body is at least one radially extending cutting edge for cutting parts of the workpiece interior wall.

Description

TECHNICAL FIELD OF THE INVENTION[0001]The thread 18 of the thread forming portion is non-circular (see FIG. 2). Instead, each flank is provided with a pointed thread part, each forming a lobe 30 for plastically deforming the interior wall of a hole while forming an internal thread.TECHNICAL BACKGROUND[0002]Such a thread forming tap is known from EP-A-0 767 024 (corresponding to U.S. Pat. No. 5,797,710). That kind of tap is however disadvantageous, as it can barely be used for other openings than circular cylindrical holes.SUMMARY OF THE INVENTION[0003]The object of the invention is to achieve an improved thread forming tap.[0004]This has been achieved by the tap of the initially defined kind, wherein at the open end of the elongated body, at least one radially extending edge is provided for cutting parts of the interior wall of said opening.[0005]Hereby is achieved a thread forming tap that pre-forms an opening to a form suitable for thread forming, which in turn extends the working...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B23G5/06B23G7/00B23G7/02
CPCB23G7/02Y10T408/9048Y10T408/904B23G2210/16B23G5/06
Inventor HAKANSSON, BJORN
Owner SANDVIK INTELLECTUAL PROPERTY AB
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